If you would like to request Clean Truck Check Referee Services, Please visit https://cleantruckcheck.arb.ca.gov/ to create a Referee Appointment Request form.
CARBTest service appointments will only be available to vehicles that fall under one or more of the following:
State-Directed Testing (NST/Citation)
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You received a notice from California Air Resources Board (CARB) directing your vehicle for CARBTest testing. The vehicle must be inspected by CARBTest within the period specified in the CARB's notice.
Engine Change Verification
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Your vehicle has recently had an engine change and needs the CARBTest's verification of the engine change for compliance with the California Clean Truck Check program. An "engine change" is the installation of an engine in a vehicle that is different from the vehicle manufacturer original configuration as certified by the United States Environmental Protection Agency (U.S. EPA) or California Air Resources Board (CARB).
Alternative Fuel Retrofit Verification
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Your vehicle has recently had an alternative fuel system retrofit and needs CARBTest's verification of the fuel system retrofit for compliance with the Clean Truck Check program. "Alternative fuel retrofit system" or "retrofit system" is a package of fuel storage and delivery, ignition, emission control, on board diagnostic, and engine components that are modified, removed, or added during the process of modifying a motor vehicle or engine to operate on an alternative fuel.
Motorhome Conversion Verification
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Your vehicle has been recently converted to a motor home and needs the CARBTest's verification of the conversion for compliance with the California Clean Truck Check program. "Motor home" means a vehicle that is designed exclusively for human habitat for recreational or emergency occupancy.
Credentialed Tester Not Available In My Area
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There are no available credentialed testers to perform your vehicle's compliance test and you would like to request CARBTest to perform the vehicle's required compliance test.
Inspection Incompatibility/ Alternative Test Procedure
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Your vehicle's condition makes it incompatible with CARB Clean Truck Check test procedures due to unusual vehicle configurations, design, or other inspection incompatibility.
Parts Unavailability Compliance Time Extension
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Vehicle Owners who are unable to repair or replace part(s) needed to bring a vehicle into compliance to complete the Clean Truck Check Test Requirement, may be granted an extension of the vehicl's periodic emissions compliance testing deadline. The extension will allow the vehicle to operate until its next emissions testing deadline. Vehicle owners may purchase new or used parts, except for emissions components prohibited by CARB or the State of California. Emissions components not approved by CARB are illegal to operate in the State of California.
If you are requesting more information regarding the Clean Truck Check, please email hdim@arb.ca.gov with your questions on compliance or visit Welcome - CTC-VIS to login and request Clean Truck Check Referee Services using your CTC-VIS account.
Test Result Dispute
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The vehicle owner disputes an inspection result and requests an independent evaluation of a vehicle's compliance status. The referee will conduct a suite of Visual, Smoke Opacity and OBD download to verify compliance status of the vehicle.
If you are requesting more information regarding the Clean Truck Check, please email hdim@arb.ca.gov with your questions on compliance or visit Welcome - CTC-VIS to login and request Clean Truck Check Referee Services using your CTC-VIS account.